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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09b71a6a79bca43c9574cf71e6c90cbad62446d8e2c1df870ee3667773b28a0' 
  AND token = 'F/2ZDiGWsfsPW8e8HQKkkYaj0CARYJEmVg7Sug6S/dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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