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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f95e26208d85ba85b34835e98c6247254b8885200fee741f81b3413abe654dfd' 
  AND token = 'ryL/rCuh8hgvOOiamTKLKFtrN5Q6QQCZjpRA7OnJbS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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