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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb77eb9bcc0f5cf30bbc2f91147db8cbe594c790533758b6449b6bf83a6827c' 
  AND token = 'bTgbCFFv73i5JJF1eesRS2x43UJz0eL3sDovYMIv85I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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