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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc00fa4a5e46e298a12ca7fafb7aa597078de2e34f1323ed0d8e3419244cf4a' 
  AND token = 'mMKfoK7kFieF3QvlM77w+nYRWbSTur7QOsxEgAoa9RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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