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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df26457cd8ee9d11a95932010d2d0ba243185f8084e4855334572668a1e0fea' 
  AND token = 'vh7PxHUd+4Rxt9b2U2cV4IWQ3fP/MiQrVzcPKJCiiyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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