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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb37e6ae093e6f13927f16f1a15d363ce3d510642b732517060239c8d56d646' 
  AND token = 'Jc/1TdqHeUf+qjuGfbz+n+zaQ8tRAhdgxL0vOc1eQgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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