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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54d2666478620342dc259f741f91078ad35fe06de72d5a088a26b0b1d3a77408' 
  AND token = 'U0CTe5hN3jseXynSzfrtIMeIa2dMAP6hlqc0eo1x7gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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