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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f313af807a311a670bb5435fb8c01eafe3524be2b0b485384a86d5b2fc32ba3' 
  AND token = 'hS4qYf7hOgI9xIBaQNr0HdwJdoFkQUT+Qnhd+v36nS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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