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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f0ca4b0fb0a810e8a42374ad17784750b908efbd63ae3056527388b41a6229e' 
  AND token = 'L2j9IV0ITaaVilUh75eNEoYOaMro1bWluYxH5q5yscc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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