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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba1477a03ad264312a079c7d1ba5caa318d9fae14398b019e44da5b3a000058' 
  AND token = 'syBU3FDrb87wqAVFpVqMoLHhpFu2LfYWhApy9F4DLDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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