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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913953baad435c86f79c4c5b11e17896b1c2f5be5063699569a4ae8eb34c6ea1' 
  AND token = 'cJyXQp+Y5N6YKxX3Xf9VeV3nHg97nWQkK5U6/AzmLAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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