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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f715f7da3a472ba80c8a395f625036ef65d7e9ea98e90ca9077970693745a7cb' 
  AND token = 'XifK3hWxoCSqFoVgt3bz4B13BqSeLR7y9rJvoR5S9t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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