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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0facb3970b182a7a22deb78b5459ce4b5609ee2f374f7e02e65d86807af6256a' 
  AND token = 'UqLO+7L4kVgshetcDSTqvVpDiQ+XtHvs7uhI1hfEEhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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