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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab64fa28e33d0a63cfa6b0f7a3bf9a862887b230e87aec4a0629aaa65b79056' 
  AND token = 'VOOCP5el8XJB9taWzO207wobHvieQrURZJvFZOtLjX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}