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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc58ff5fed7c81bbc471beafc206d3bc98f55ba3c08d652a491f6e883df3e0a' 
  AND token = '2Nt6JBar7vCMlsMbHxlmaFzP4tV6ae0ePwk+JloSgkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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