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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39cbc54ff7305820562d14e3403c82362124f57d6f2f11af67ea42c8dfb036f1' 
  AND token = 'Gr/W1hpmSta3B93svgcyWUYMPuJ6IZ9JCvnrcW2eyto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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