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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f1740a3721d20043d3ab36c0b72c33dcc48ade2a242634c8d2c607db56fd842' 
  AND token = '4no6CaehtuoDOOQgYXLFqfEN0pcaU24RF2MwqoE8cro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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