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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a625f8ec1046d2a6ac0a36125fe7667580197bfd259d09a7be240d26c53c9540' 
  AND token = 'oD1R3TZhQPiGBN7biYXFt1hpzWfVoz3bkOqi1OkJuXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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