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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b2c8a4c3b757f157548e43f08df76878a235b81ea5811c1dd826a997ebbb78' 
  AND token = 'ZzG60o86I770U8kiV+PkOOXxe82hkDIee1Ba9h5rwgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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