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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efeab48a7689db2ee8c56c26f6be085fe5b83cb3a783b73f62a3a2e958fe2f98' 
  AND token = '4y96Co81QVBWhhhjLoOai34oJXqQp5dJ/+XtoBjfXMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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