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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c70f39b13499fb3ebaf3941b90df32f2115cdb1c4a7ced7c2b81b7cae38bd7' 
  AND token = 'Su2bPRSqscyv8VlrQcYLvUhiSY4oGcItah/b3iAkFWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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