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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52de9d34affd0d6d1d8177a6a49304b944be39507579697f7d6d9849ca370435' 
  AND token = 'hQ3gy02sLsjuu5pdLP989IEaUaCcQ7svduGdRGp169c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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