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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9973f078f762ba280d4a517a039874cfacaa153e8184284897ecafd343d24bb' 
  AND token = 'QqeCSDeYotXqJVW3dUmhfqurfNisXVW4Dtb86I/q5xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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