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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7388eef8fa42c3796be4e2d19bda240ea780d8eb407b90534b103e9ac40c9a6c' 
  AND token = '4r0znOHC5sOuqx4FhuRoqQYC3QZwQqx8ruj+CEHPkRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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