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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1866159813b0cc1c0751b420b259a978fd1d078f43f2caca2da6ef096737b44b' 
  AND token = 'e2Oe+msCNEiwnNiDlXsS3/hFtWHVW0RXja82Kc3euDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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