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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b282257ded5303f87587e3c468fc8a1485166f9eb61860a19344c32637799e35' 
  AND token = 'ygod+GX1h78CSapRYv1tvxCTK8YalSdy2BK1lPKv7Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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