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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937cb48f3418c473d2a4a2a82415ebcc5cfce344db0887a026746c348c7023d1' 
  AND token = 'HuLJvG9og36vE6tb96JKcdWHqA06cwe0DsUnodr3nmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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