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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39123165e979b241605be0175d065ff94f6e46e5eaf4571e0344167723dafbe1' 
  AND token = 'PkldaziC2QaZ0kSrZH+Bn9c/N4z9WV8lsd+895hzvH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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