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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7148e4ec71e0e6d0089d776e479176d216b5684669fd7dcfb97e604fb9dff91' 
  AND token = 'iDDxvFcFuZlGjvXzxLP8eKxi6pFs4inm41QVoUGgpag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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