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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5dbbaf333083a690690645c79accbf838b87c2cc35463affb21558a7d47f981' 
  AND token = 'juqVS//3dNmAVFnWk3c6deEpk8Fqum2lAR/Qmg0zivg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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