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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba8fb2beea45fbbf237acd38a5df20c700eb418d4c298839ebe3808be98c57b' 
  AND token = '8rzLArpvET/C2DwvZX7MGSswvroR7kOYWVdvG/fDFgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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