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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f6a6a6b6da805ffec2459a309acf15dd0bbb560288df12e9b908ba6b2e61e3b' 
  AND token = '6xobEDagYJeuKMdhKV3iZid95QUnMdS7qQBanyj1pM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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