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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b430d9ed15053364be59d2b71ec9bf8c2f33682ab579a82d26403e759589c6d8' 
  AND token = 'XUkGcnch2NpxhR91FUABhqiZamMXw+CbF/RBahpGR48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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