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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '374ee7c30c2faf8901f27e9267e3c9be8fc90c5efb3edca01ed36f9e6b7e0f5d' 
  AND token = 'elOB4vtmjCfDyjC0kio2Y9Gtch5YDbaGoGT9vomfsFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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