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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33330f05cd600e56eed8b2c5992e7eb713e8c09ef971427afdb9266d20191ce' 
  AND token = 'Km5BEK3apwQuM65v2+hnw5JWjj+bmZuOyWLpTv3lnJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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