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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e8cb9c9b93a0d8314060e0240e1d0b89c8958e360f1d68747d44dc9d4e5f64' 
  AND token = 'u06WFbuy8unIdKQuVt913w8eOBfZVrvHSvbx4tBsXBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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