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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9989f3a2f60b489cf3b98742d9bf385bcc640858e422aef9845be600f8aeed' 
  AND token = '8UvSWz/PGnY46jmxBiKL4vrs99Bdt8Qw7F5lxTK1ekQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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