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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4dcb1cd7eba94c06fbdb07b0decd68d5300bd675f13a93c2adcd73a13df277b' 
  AND token = 'HoYocnlPMc+xI0xW0CVDnj49cDkxeXRNbT+MQUthv54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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