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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85594b1a2b662a5a562701f9b617a661a969be321f8d6bc3da7d3c824a56a47f' 
  AND token = 'uB9B/lckuy1RUKmbSEzuf4kH+64CnR532PXZX8Au+3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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