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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad02cbdcfa296ba4e85bf3fe61c5528386609901b68a2af0b279166728266ef' 
  AND token = '0yy9Hn0dmH2IMqxOaZFiGr0j3wiTYhsREFF75mea0i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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