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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c7f8910a57302ff22ea7c67565b302d1dd8920db7a16237a6cd8d174456a20' 
  AND token = 'NdK7ZhrDxs/m9PfmcHb0BSVUhcbSYWXAFXp/NJSl78M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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