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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0fb31c6435d71e178f3e1c4817f949d85263b85f3ab0d8bdd9fac7d03c52b1a' 
  AND token = '25gJLf1BBValr95S2SNv19tnSCEBIC4tpSRljLbWoGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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