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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5147f349a8f8f73b6ef29ded748df7b3340b96d3bef9e95b3144411d26f84864' 
  AND token = 'vQ4YNoY9iVAkY32Ko4+Lq2WKGQWvmHH2phYzd9Dybcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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