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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89f128e29d27123690deba0fb1c16ad76bfcf7d25f0957912c91afe8beb7384' 
  AND token = 'hpI8c5/OJ1kMb8gc0PoPqxMzdPwlMeZj66aN6+N7GBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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