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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e04bd1b2a37bcab9259fe2a5595ace4ed68314f74d40fa4b157aba30267693' 
  AND token = 'RHOvRxrLq1u/fhTxFInvWV7Ej1fia+rAOcw+MWRbphU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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