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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d564fbe510a257550713720f377f841582e0a29c3eda009b9d13d598009076' 
  AND token = '9kep99tVBHiCpXnsIvy/XoqKux2Ppb/gOkmGZ7irAQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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