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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e02126b640bd0537f6664f1f33e209aa3777dd43e492cca942b953530a3673f4' 
  AND token = 'bAwm1S2sBiKfNc6RFV6lqCHgP3ib/m/9aJT4BOFnq38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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