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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9dafe0371864ea0df579e6db15ab3203539b3f18547dc7c2b263c32d9bc1472' 
  AND token = 'moh9GFTvMwkjlU7t33ge9qDqfODpK5oLlh5A5M1Bh0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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