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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e6724f8b4943ca3576dc8a7a521c35b0a5f71ca7ed3903a974461aefa9f6ced' 
  AND token = 'kT+gQxdCEd2/+XDNbXS+M3r7jf2mikmMUzEqnwpSRMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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