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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3aef34306eca17c7309d25a382bd93767cf3b3956a4b388809b659e8380413d' 
  AND token = 'wtzzCEO730JmEaxK7N0pdrO1L91wTXfc6sgMq3pO0aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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