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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd991b4f534372c60fdcddb680a5342f1bd744425b4788ffeff7900b6acb9a904' 
  AND token = 'W5Id2+RJ2F7i7w1F7P3P7bCC7+8QgVXfaP2pv7+90I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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