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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e189272a0a297148e2afd07b8144411357e30118b5609c7fb0784d75803b8f20' 
  AND token = 'dx5sqDSWW7FnzmxD9KAJeAgbTSUl4QkGfvkunW+LL5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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