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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4a6b7728731a01aa9224cd66384d785912811640de17bee1775b6ac12df979' 
  AND token = '94y9IBX+72hoVDiWTnNjHwpLB6y5XeU3ilRxigEJV5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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