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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a38850f967ce5fd160aa6c14e5609b615ceccf3c951ccfb0f1bddb1d27fbb47' 
  AND token = 'BffRs5COjxpVKWzz5fX9eKa+mJhQRQ5pFmubaIWsC6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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