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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9506d6b6422556678ac0ed80e62453d26c485d9597275a93a2a4d4b9f42b7ac' 
  AND token = '2JiXOeOMJivbPtE5nbNTCQOXywKMs0WNmAzh3RyDub4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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