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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f1b2906f68ee9d47aed24c0b6bef7a2f348f3d15924731e98d2899c559d37fc' 
  AND token = 'Om4nbeeJELE6I52ei+Q7SnwXcCDeGQhheq6sXOVlJS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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