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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869b2a5a026efbdcd613bcfe12a819d0b857334ee95f96d34aa6fbe3a5776ec4' 
  AND token = 'vVnUCv9ySiGe8jj6tabM9tqriW8pXWLwSNVPE9vzatk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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